Friedricii eiche



(No Model.)

F. EIGHE.

KEY HOLE GUARD. No. 410,506. Patented Sept. 3. 1889 UNITED STATES PATENT O FICE.

FRIEDRICH EIOHE, OF .SOHANDAU, SAXONY, GERMANY.

KEY-HOLE GUARD.

SPECIFICATION forming part of Letters Patent No. 410,506, dated September 3, 1889.

Application filed August 8, 1888- To all whom it Hwy concern.-

Be it known that I, FRIEDRICH EICHE, dentist, a subject of the Emperor of Germany, residing at Schandau-Sachsenburg, in the Empire of Germany, have invented certain new and useful Improved Closing Devices for Key-Holes of Locks, of which the following is a specification.

The object of the present invention is to provide looks with a safety-closing device, which will effectually prevent them from being picked or opened after being locked and the key withdrawn.

Most locks, and especially those manufactured wholesale, with tubular keys or keys with solid shanks, can be unlocked with more or less difliculty with master keys or picked with skeleton keys, hooks, and the like, and offer, therefore, little security against burglarious entrance and theft. By this invention, however, each lock can be secured against being picked, by the introduction into the keyhole of a safety closing device, which is adj usted by a small key (kept by the owner) in such a manner that it cannot be moved without the help of this small key. The form of this small key is different for every lock and is intended to be kept secret by the owner. The form of the device also diifers for looks with tubular keys from those with keys having solid shanks.

In the accompanying drawings, Figures 1 and 2 represent the ordinary solid-shanked key in the lock. Figs. 3 and 4 represent a closing device for looks with keys having such solid shanks. Figs. 5 and 6 represent the different parts of this closing device. Figs. 7, 8, and 9 are cross-sections of the sleeve shown in Fig. 6 on lines I, II, III, IV, and V VI, respectively. Figs. 10 and 11 represent small pinchers for introducing and withdrawing the closing device. Figs. 12, 13, and let represent a closing device for looks and keys having solid shanks in plan, front elevation and section, respectively. Figs. 15 to 17 repre sent a similar device with a modification.

The closing devices for lockswith keys having solid shanks consist of a sleeve, Fig. 6, formed with transverse slots B and M, and in which turns a core or plug K, provided with the key-bit B and a pin M, as shown at Fig.

Serial No. 282,263. (No model.)

5. The plugs or cores K are adapted to turn in the tubes II, so that the key-bit B may be turned in order to engage with the inn er wall of the lock. After the closing device has been introduced the tube H does not turn in the key-hole. To this end the tube II is formed with the two beforeanentioned transverse slots B and M, the former, Fig. 8, for the keybit B, the latter, Fig. '7, for the pin M,

which is fixed into the core after the latter is introduced in the tube for the purpose of holding it in the tube. This pin may, however, be omit-ted if the longitudinal slot for the introduction of the key-bit is afterward closed. The core and tube are removed from the keyhole by the small pinchers Z Z or the small keys Z Z, Figs. 12 and 17, after the core K has been turned, so that its key-bit B registers with the key-hole.

The removal of the closing device from the lock is only to be effected by the owner, and therefore an instrument different in form for each lock is used. This instrument may be in the form of pinchers Z, Fig. 10, which are pushed over the projection O of the core K and engage with two teeth or pins z in the said projection; or the instrument may be in the form of a pair of extending levers Z pivoted together, Fig. 11, for which the core K must be formed with recess A and transverse holes. Instead of these instruments, a small key may be used, which engages with the core or the tube of the closing device. Fig. 17 represents such a key, which would fit the devices repre sented in Figs. 15 and 16 and engage the core K The key Z ends in a small projection of any desired section and provided with a small key-bit b. This projection fits in an opening in the core or tube. The key-bit is turned in a transverse slot in this opening, and thus the core or tube can be turned and extracted from the keyhole of the lock. The small key Z Figs. 12 and 13, is also provided-with a projection for turning the core, but has no keybit. Instead of the latter, the bow of the key is in the form of a spring with a hook hat the end, which is pressed over a projection of the tube II" and engages with this projection, when the closing device may be withdrawn.

\Vhen the lock is locked and the key with- IOO drawn, the closing device is introduced in the key-hole and the key-bit is turned, so that it engages with the inner Wall of the lock. The small turning instrument or key is then withdrawn until it is introduced again for the purpose of Withdrawing the closing device.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that What I claim is- A removable key-hole guard consisting, essentially, of a sleeve having a pair of peripheral slots extending partially around the same, and a core loosely located and adapted FRIEDRICH EIOHEQ WVitnesses:

OTTO Wonrr, BRUNO KOSSNER. 

